2010-03-08_REVISION - C1981008 (2)

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United States Department of Agriculture N R C S Natuaai Resources Conservation Service Jim Boyd, Rewume Conservationist P O Box 2?9 NotrwoW, CO 61433 March 8, 2010 Division of Reclamation, Mining and Safety Department of Natural Resources 101 South 3"l Street, Suite 301 Grand Junction, CO 81501 Dear Concerned Parties: =_m Boyd@co usda goo 970-327-424,5-OFF !C F 970-327 4247-FAX At the request ofthe Morgan Family l have designed a sideroll sprinkler irrigation system using NRCS irrigation design criteria for approximately 97 5 acres of their property within the mine permit boundaries of the New Horizon Mine, Western iruels-Colorado. U)oking at aerial photography from 1973 and 1993, it is evident that a majority of the Morgan property was irrigated and crapped. Of the 109 acres that has been or will be misted by Western Fuels, l estimate that at least 90% of it was historically irrigated for crop production. The irrigation system design for the Morgan property requires four, quarter mile long side-roll sprinklers, and two pipeline manifolds to feed the sprinklers (see the enclosed plan map). The irrigation system will utilize: 60 shares of Colorado Cooperative (CC) Ditch water, which equates to approximately 1 64 cubic feet per second (cfs) during the month of July. While in operation, only two sideroll sprinklers will be running at the satire time, one on each pipeline manifold, unless more irrigation water is supplied to the system The sprinkler set, or run time, will he 12 hours between moves, and the sprinklers will be moved once every 24 hours with all four sprinklers having one 12 hour set in alternating fashion. Each sprinkler is designed to utilize 0.82 cfs, while operating at near 35 pounds per square inch (psi) of water pressure. Please review the enclosed Siderolt Sprinkler Design Worksheet for more details. This proposed irrigation design provides the most efficient and flexible system for the conditions presented. location, soil type, crop(s) grown, available irrigation water, field geometry, etc. With proper management- this irrigation system will adequately irrigate 97 5 acres of alfalfa with 60 shares of CC hitch water There is ]ell a trapezoidal piece of land it, the southeast corner of the Morgan property, approximately 11 5 acres, that is not addressed by this irrigation system design. To irrigate this area sufficiently, one would have to consider using ether irrigation systerns such as big-gun sprinklers, hand set sprinklers, or gated pipe In addition, more irrigation water would have to be supplied to the system to properly irrigation this acreage, Ttw, Natur.rl R.-, U, VV CO(Me A110n y4U,wa? aka in partn¢ tNp v iStr liu• ,Anu?rv In fit.NnOW to atmmftrve and m i-Anm Itaturrt rM:.rwrCgy on prrrala teach. Am Egt? l 0p;xAlunrly Provti *r and Empluyw-1 Monday, March 08, 2010 (3).max